To check which rubygems versions your different rbenv rubys are using, you can use this small bash script:
Copyfor i in $(rbenv versions --bare); do rbenv shell "${i}"; echo -n "ruby ${i} has gem version: "; gem -v; done
for i in $(rbenv versions --bare); do rbenv shell "${i}"; echo -n "ruby ${i} has gem version: "; gem -v; done
Copyrvm all do gem -v
rvm all do gem -v
